import Vue from 'vue'
import VueRouter from 'vue-router'
import Login from '@/components/Login.vue'
import Home from '@/components/Home.vue'
import Welcome from '@/components/Welcome.vue'
import Users from '@/components/user/Users.vue'
import Rights from '@/components/power/Rights.vue'
import Roles from '@/components/power/Roles.vue'
import Cate from '@/components/goods/Cate.vue'
import Params from '@/components/goods/Params.vue'
import List from '@/components/goods/List.vue'
import Add from '@/components/goods/Add.vue'
Vue.use(VueRouter)

const routes = [
  // 路由的重定向
  {
    path:'/',
    redirect: '/login'
  },
  {
    path:'/login',
    component:Login
  },
  {
    path:'/home',
    component:Home,
    redirect:'/welcome',
    children:[
      {
        path:'/welcome',
        component:Welcome
      },
      {
        path:'/users',
        component:Users
      },
      {
        path:'/rights',
        component:Rights
      },
      {
        path:'/Roles',
        component:Roles
      },
      {
        path:'/categories',
        component:Cate
      },
      {
        path:'/params',
        component:Params
      },
      {
        path:'/goods',
        component:List
      },
      {
        path:'/goods/add',
        component:Add
      }
    ]
  }
]

const router = new VueRouter({
     routes
})

// to 将要访问的路径
// from 代表从哪个路径跳转而来
// next 是一个函数，表示放行
router.beforeEach((to,from,next)=>{  
    if(to.path === '/login') return next()
    //从secessionStorage中获取token
    const tokenStr = window.sessionStorage.getItem('token')
    // 如果没有token强制跳转到登录页
    if(!tokenStr){
      return next('/login')
    }
    // 有token放行
    next()
})

export default router
